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Hi there,
I am getting this error when I run the code from step 7.
"""
self.grid.place_agent(trader, (x,y))
:83: UserWarning: Agent 4139 is being placed with
place_agent() despite already having the position (30, 30). In most
cases, you'd want to clear the current position with remove_agent()
before placing the agent again.
"""It seems to happen with the code from the github as well. Any ideas?
Hi Geoff，
place_agent method checks whether the agent already has a position before placing it. You could simply solve this issue by setting pos = None when creating a new agent. Here is the source code.
@warn_if_agent_has_position_already
def place_agent(self, agent: Agent, pos: Coordinate) -> None:
"""Place the agent at the specified location, and set its pos variable."""
x, y = pos
if agent.pos is None or agent not in self._grid[x][y]:
self._grid[x][y].append(agent)
agent.pos = pos
if self._empties_built:
self._empties.discard(pos)
self._empty_mask[agent.pos] = True
I'm running the code as shown in session 5 but getting the follow error - any ideas?
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
in ()
----> 1 model = SugarscapeG1mt()in __init__(self, width, height)
19
20 agent_id = 0
---> 21 for (x,y) in self.grid.coord_iter():
22 max_sugar = sugar_distribution[x,y]
23 if max_sugar > 0:ValueError: too many values to unpack (expected 2)
I've not figured out the error:
for _,(x,y) in self.grid.coord_iter():needs the brackets around (x,y) removed to become:
for _,x,y in self.grid.coord_iter():I have forked the session 5 on GitHub and suggested the change
- Eka Putri Difayanti
- 10 Nov 2024 10:37pm UTC
- in Agent-Based Models with Python: An Introduction to Mesa
I have the same problem. Did you find a solution?
I've had the same problem as well, did anyone come across a solution?
Did this fix not work?
for _,(x,y) in self.grid.coord_iter():needs the brackets around (x,y) removed to become:
for _,x,y in self.grid.coord_iter():Hi Tom, actually I am struggling with another issue when I try to run the last step in the fifth session I get this error about the number of arguments being incorrect with the __init__() function in the Sugar agent parameters, but the code I've used is a direct copy of the Session 5 code provided. Any thoughts on how to troubleshoot would be greatly appreciated. I am new to Python & ABM so the syntax is still new to me
Error message:
TypeError Traceback (most recent call last)
in ()
----> 1 model = SugarscapeG1mt()2 frames
/usr/local/lib/python3.10/dist-packages/mesa/agent.py in __init__(self, model, *args, **kwargs)
62
63 """
---> 64 super().__init__(*args, **kwargs)
65
66 self.model: Model = modelTypeError: object.__init__() takes exactly one argument (the instance to initialize)
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Hi! I really enjoyed the tutorial and wanted to try tackle the homework. I got stuck at part 3, especially the part regarding establishing new connections, and I wanted to check the solutions but I coulndt find any solution after part 1? The titles are clickable but no file is downloaded or accessed. Any help woulde be appreciated!
Kind regards!
1) For the case of shrinking steps, we have, step length ~ (lambda)^n with (lambda less than 1). Sor, for negative value of n, step length should approach infinity always, but in the plots shown in the video, P as a function of lambda goes to 0 as n tends to negative infinity. What is the reason behind that?
2) How, for the case d=0, the expression of rho becomes ln(t)?
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